Flerida's cleric (Jhianna) is coming up towards 18 as well at the speed of Sherina (Jo's third lifer bard). Currently they are 13, but holding 14 if I recall correctly. When they both get up there we can probably move on with our high level toons (or semi high level since they can't do epic at 18).

So if you need more epic toons and have others moving up alongside Jhianna and Sherina you can probably just play your current level 18-19 to 20. My fighter can certainly help with level 18+ quests.